Quinn Emanuel Urquhart & Sullivan

As of May 2026, Quinn Emanuel Urquhart & Sullivan, LLP stands as a dominant force in global patent litigation. A litigation-only AmLaw 20 firm, Quinn Emanuel is headquartered in Los Angeles and operates a network of over 30 offices worldwide with more than 1,300 attorneys. The firm is consistently ranked in the top tier for patent and IP litigation by major legal directories, including Chambers and Partners, which places it in "Band 1" for nationwide patent litigation in the USA. Intellectual property litigation is the firm's largest practice, with patent disputes accounting for the vast majority of that work.

The firm's patent practice is known for handling complex, high-stakes disputes for the world's leading technology and life sciences companies. Based on its representative cases, Quinn Emanuel demonstrates deep expertise in areas such as software, semiconductors, consumer electronics, internet technology, and pharmaceuticals. This is reflected in its work for clients like Google in disputes with Intent IQ, LLC; Samsung in litigation brought by Whirlpool Corp. and VB Assets, LLC; and Apple in a case filed by Ingeniospec, LLC. The firm's own materials highlight its work in telecommunications, medical devices, and Hatch-Waxman litigation.

Quinn Emanuel litigates aggressively for both plaintiffs and defendants, a fact supported by its public statements and its varied case docket. The provided case list shows a majority of representations on the defendant side (9 of 14 cases), where the firm frequently defends major operating companies like Google, Apple, and Samsung against infringement allegations. However, the firm also takes on significant plaintiff-side work, as seen in cases such as Yahoo! Inc. v. AlmondNet, Inc. and Whirlpool Corp. v. Samsung Electronics Co. Ltd. One of the firm's most notable recent plaintiff-side results was securing a $1.1 billion jury verdict for the California Institute of Technology (Caltech) against Broadcom and Apple, which was largely affirmed by the Federal Circuit.

The firm maintains a highly active and successful practice before the Patent Trial and Appeal Board (PTAB). Quinn Emanuel states on its website that it has been ranked among the top five firms at the PTAB every year since 2018 and has been recognized as one of the "most active" and "best performing" firms in IPR proceedings. The firm's leadership in patent litigation includes prominent partners such as Charles K. Verhoeven, who appears in six of the tracked cases for clients including Yahoo, Google, and Samsung. Other key partners named in industry publications and the firm's case history include Victoria Maroulis, David A. Perlson, and David A. Nelson.